General EEEMCal Meeting Summary 9/17/21

PARTICIPANTS: Carlos, Douglas, Hamlet, Hrachya, Sasha, Irina, Crytur-team, Josh, Julien, Lei, Petr, Vardan, Tanja

EEEMCAL IN DETECTOR PROPOSALS OVERALL

• Simulation analysis ongoing

• EEEMCal teams working on validation of calorimeter performance - ATHENA: AANL, ECCE: U. Kentucky, IJCLab-Orsay

• Cost estimates for EEEMCal submitted to detector proposals

• assumes in-kind as documented in the EOI

MATERIAL IMPACT STUDY (Sasha)

• Performed study of material impact in front of calorimeter - extension of YR study

• 5 interaction length can impact things considerably - recon cluster associated with track may not be enough as electron radiates --> should reconstruct clusters also associated with radiated photon; calorimeter should measure down to 50 MeV

• 5% of radiation length within 1m then have considerable impact; impact of material within 50cm of calo can tolerate more

• magnetic field dependent - impact more severe for higher field

MECHANICAL DESIGN (Julien, Carlos)

• Presentation and discussion

• estimation of load and resulting deformation and stress on inner ring -- suggests that 5mm is sufficient
• sensor and PCB positioning
• cables/services positioning
• flange location and impact on crystal inner radius - currently at ~-3.5 in eta, may reach smaller eta if flange could be moved (not trivial due to access and servicing)

• Impact of different size glass vs. crystal on load on inner ring

• should not be a problem since also have carbon inner structure - can't move

• Carbon inner structure

• no special structure between crystal and glass

• Action items:

• Temperature impact - different sizes
• check if longer glass, e.g., 50cm instead of 40cm would be a problem for mechanical structure, e.g., inner ring load
• Flange position

BEAM TESTS

DESY

• Preparations ongoing

• shipment expected end of September
• Covid travel

JLAB

• Delays with beam start up in Hall D. Discussion on revised prototype beam test scheduling in next few days

• Expect first phase of calorimeter beam test program in beginning of October

CRYTUR PROTOTYPE

• Prototype has been assembled and tested at Crytur - results look very good

• PWO was cooled to -25degC for signal test

• Power supply is external

• Plan to ship prototype to CUA ~October 10th to arrive around October 18th

• Plan to travel to CUA to assist with the assembly and any initial testing

NEXT MEETING: FRIDAY 8 OCTOBER AT 8:30AM ET